1 files changed, 59 insertions, 0 deletions
diff --git a/packages/instant/src/redux/analytics_middleware.ts b/packages/instant/src/redux/analytics_middleware.ts
new file mode 100644
index 000000000..f971dbd33
--- /dev/null
+++ b/packages/instant/src/redux/analytics_middleware.ts
@@ -0,0 +1,59 @@
+import { Web3Wrapper } from '@0x/web3-wrapper';
+import * as _ from 'lodash';
+import { Middleware } from 'redux';
+
+import { ETH_DECIMALS } from '../constants';
+import { Account, AccountState } from '../types';
+import { analytics } from '../util/analytics';
+
+import { Action, ActionTypes } from './actions';
+
+import { State } from './reducer';
+
+const shouldTriggerWalletReady = (prevAccount: Account, curAccount: Account): boolean => {
+    const didJustTurnReady = curAccount.state === AccountState.Ready && prevAccount.state !== AccountState.Ready;
+    if (didJustTurnReady) {
+        return true;
+    }
+
+    if (curAccount.state === AccountState.Ready && prevAccount.state === AccountState.Ready) {
+        // Account was ready, and is now ready again, but address has changed
+        return curAccount.address !== prevAccount.address;
+    }
+
+    return false;
+};
+
+export const analyticsMiddleware: Middleware = store => next => middlewareAction => {
+    const prevState = store.getState() as State;
+    const prevAccount = prevState.providerState.account;
+
+    const nextAction = next(middlewareAction) as Action;
+
+    const curState = store.getState() as State;
+    const curAccount = curState.providerState.account;
+
+    switch (nextAction.type) {
+        case ActionTypes.SET_ACCOUNT_STATE_READY:
+            if (curAccount.state === AccountState.Ready && shouldTriggerWalletReady(prevAccount, curAccount)) {
+                const ethAddress = curAccount.address;
+                analytics.addUserProperties({ ethAddress });
+                analytics.trackWalletReady();
+            }
+            break;
+        case ActionTypes.UPDATE_ACCOUNT_ETH_BALANCE:
+            if (
+                curAccount.state === AccountState.Ready &&
+                curAccount.ethBalanceInWei &&
+                !_.isEqual(curAccount, prevAccount)
+            ) {
+                const ethBalanceInUnitAmount = Web3Wrapper.toUnitAmount(
+                    curAccount.ethBalanceInWei,
+                    ETH_DECIMALS,
+                ).toString();
+                analytics.addUserProperties({ ethBalanceInUnitAmount });
+            }
+    }
+
+    return nextAction;
+};